Alaska Stat. § 23.10.640
(d) Drug testing, including on-site drug testing, must include confirmation of a positive drug test result. The confirmation must be by use of a different analytical process than was used in the initial drug screen. The second or confirmatory drug test shall be a gas chromatography mass spectrometry. An employer may not rely on a positive drug test unless the confirmatory drug test results have been reviewed by a licensed physician or doctor of osteopathy. The physician or osteopath shall